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.TH DU 1 "March 14, 2017"
.SH NAME
du \- summarize disk usage
.SH SYNOPSIS
.LP
.nf
\fB/usr/bin/du\fR [\fB-Adorx\fR] [\fB-a\fR | \fB-s\fR] [\fB-h\fR | \fB-k\fR | \fB-m\fR] [\fB-H\fR | \fB-L\fR]
     [\fIfile\fR ...]
.fi

.LP
.nf
\fB/usr/xpg4/bin/du\fR [\fB-Adorx\fR] [\fB-a\fR | \fB-s\fR] [\fB-h\fR | \fB-k\fR | \fB-m\fR] [\fB-H\fR | \fB-L\fR]
     [\fIfile\fR ...]
.fi

.SH DESCRIPTION
.LP
The \fBdu\fR utility writes to standard output the size of the file space
allocated to, and the size of the file space allocated to each subdirectory of,
the file hierarchy rooted in each of the specified files. The size of the file
space allocated to a file of type directory is defined as the sum total of
space allocated to all files in the file hierarchy rooted in the directory plus
the space allocated to the directory itself. This sum will include the space
allocated to any extended attributes encountered.
.LP
Files with multiple links will be counted and written for only one entry. The
directory entry that is selected in the report is unspecified. By default, file
sizes are written in 512-byte units, rounded up to the next 512-byte unit.
.SS "/usr/xpg4/bin/du"
.LP
When \fBdu\fR cannot obtain file attributes or read directories (see
\fBstat\fR(2)), it will report an error condition and the final exit status
will be affected.
.SH OPTIONS
.LP
The following options are supported for \fB/usr/bin/du\fR and
\fB/usr/xpg4/bin/du\fR:
.sp
.ne 2
.na
\fB\fB-a\fR\fR
.ad
.RS 6n
In addition to the default output, report the size of each file not of type
directory in the file hierarchy rooted in the specified file. Regardless of the
presence of the \fB-a\fR option, non-directories given as \fIfile\fR operands
will always be listed.
.RE

.sp
.ne 2
.na
\fB\fB-A\fR\fR
.ad
.RS 6n
Tally file size using the apparent size of the file instead of the disk blocks
it occupies. This option is useful when operating on file systems which employ
compression or in the presence of sparse files.
.RE

.sp
.ne 2
.na
\fB\fB-d\fR\fR
.ad
.RS 6n
Do not cross filesystem boundaries. For example, the command, \fBdu -d /\fR
reports usage only on the root partition.
.RE

.sp
.ne 2
.na
\fB\fB-h\fR\fR
.ad
.RS 6n
All sizes are scaled to a human readable format, for example, \fB14K\fR,
\fB234M\fR, \fB2.7G\fR, or \fB3.0T\fR. Scaling is done by repetitively dividing
by \fB1024\fR.
.RE

.sp
.ne 2
.na
\fB\fB-H\fR\fR
.ad
.RS 6n
If a symbolic link to a directory is specified on the command line, process the
symbolic link by using the directory which the symbolic link references, rather
than the link itself.
.RE

.sp
.ne 2
.na
\fB\fB-k\fR\fR
.ad
.RS 6n
Write the files sizes in units of 1024 bytes, rather than the default 512-byte
units.
.RE

.sp
.ne 2
.na
\fB\fB-L\fR\fR
.ad
.RS 6n
Process symbolic links by using the file or directory which the symbolic link
references, rather than the link itself.
.RE

.sp
.ne 2
.na
\fB\fB-m\fR\fR
.ad
.RS 6n
Write the files sizes in units of megabytes, rather than the default 512-byte
units.
.RE

.sp
.ne 2
.na
\fB\fB-o\fR\fR
.ad
.RS 6n
Do not add child directories' usage to a parent's total. Without this option,
the usage listed for a particular directory is the space taken by the files in
that directory, as well as the files in all directories beneath it. This option
does nothing if \fB-s\fR is used.
.RE

.sp
.ne 2
.na
\fB\fB-r\fR\fR
.ad
.RS 6n
Generate diagnostic messages about unreadable directories and files whose
status cannot be obtained. /usr/bin/du is silent if these conditions arise and
\fB-r\fR is not specified. \fB/usr/xpg4/bin/du\fR acts as though \fB-r\fR is
always specified.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR\fR
.ad
.RS 6n
Instead of the default output, report only the total sum for each of the
specified files.
.RE

.sp
.ne 2
.na
\fB\fB-x\fR\fR
.ad
.RS 6n
When evaluating file sizes, evaluate only those files that have the same device
as the file specified by the file operand.
.RE

.sp
.LP
Specifying more than one of the options in the mutually exclusive pair,
\fB-H\fR and \fB-L\fR, is not considered an error. The last option specified
determines the output format.
.sp
.LP
Specifying more than one of the options in the mutually exclusive set of
options \fB-h\fR, \fB-k\fR, and \fB-m\fR is not considered an error.  The last
option specified determines the output format.
.SH OPERANDS
.LP
The following operand is supported:
.sp
.ne 2
.na
\fB\fIfile\fR\fR
.ad
.RS 8n
The path name of a file whose size is to be written. If no \fIfile\fR is
specified, the current directory is used.
.RE
.SH OUTPUT
.LP
The output from \fBdu\fR consists of the amount of the space allocated to a
file and the name of the file.
.SH USAGE
.LP
See \fBlargefile\fR(7) for the description of the behavior of \fBdu\fR when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
.SH ENVIRONMENT VARIABLES
.LP
See \fBenviron\fR(7) for descriptions of the following environment variables
that affect the execution of \fBdu\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
.LP
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 6n
Successful completion.
.RE
.sp
.ne 2
.na
\fB\fB>0\fR\fI\fR\fR
.ad
.RS 6n
An error occurred.
.RE
.SH ATTRIBUTES
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.SS "/usr/bin/du"

.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Stable
.TE

.SS "/usr/xpg4/bin/du"

.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.LP
.BR ls (1),
.BR stat (2),
.BR attributes (7),
.BR environ (7),
.BR fsattr (7),
.BR largefile (7),
.BR standards (7)
.LP
\fISystem Administration Guide: Basic Administration\fR
.SH NOTES
.LP
A file with two or more links is counted only once. If, however, there are
links between files in different directories where the directories are on
separate branches of the file system hierarchy, \fBdu\fR will count the excess
files more than once.
.LP
Files containing holes will result in an incorrect block count. In this case,
one may use the \fB-A\fR option to report file sizes by their apparent size
instead.
